[python-nextgen] better datetime support in parameters (#14621)

* add allowStringInDateTimeParameters option

* add tests

* add files

* add tests for datetime query parameters

* fix file anme

* trigger build

* fix pytest

* install test requirement

* trigger build

* break build

* add new files

* fix Locale.ROOT

* update doc

samples/client/echo_api/python-nextgen/test/test_manual.py

@@ -0,0 +1,77 @@
+# coding: utf-8
+
+"""
+    Echo Server API
+
+    Echo Server API  # noqa: E501
+
+    The version of the OpenAPI document: 0.1.0
+    Contact: team@openapitools.org
+    Generated by: https://openapi-generator.tech
+"""
+
+from __future__ import absolute_import
+
+import unittest
+import datetime
+
+import openapi_client
+from openapi_client.api.query_api import QueryApi # noqa: E501
+from openapi_client.rest import ApiException
+
+class TestManual(unittest.TestCase):
+    """Manually written tests"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def testDateTimeQueryWithDateTime(self):
+        api_instance = openapi_client.QueryApi()
+        datetime_query = datetime.datetime.fromisoformat('2013-10-20T19:20:30+01:00') # datetime |  (optional)
+        date_query = '2013-10-20' # date |  (optional)
+        string_query = 'string_query_example' # str |  (optional)
+    
+        # Test query parameter(s)
+        api_response = api_instance.test_query_datetime_date_string(datetime_query=datetime_query, date_query=date_query, string_query=string_query)
+        e = EchoServerResponseParser(api_response)
+        self.assertEqual(e.path, "/query/datetime/date/string?datetime_query=2013-10-20T19:20:30+01:00&date_query=2013-10-20&string_query=string_query_example")
+
+    def testDateTimeQueryWithString(self):
+        api_instance = openapi_client.QueryApi()
+        datetime_query = '2013-10-20T19:20:30+01:00' # datetime |  (optional)
+        date_query = '2013-10-20' # date |  (optional)
+        string_query = 'string_query_example' # str |  (optional)
+    
+        # Test query parameter(s)
+        api_response = api_instance.test_query_datetime_date_string(datetime_query=datetime_query, date_query=date_query, string_query=string_query)
+        e = EchoServerResponseParser(api_response)
+        self.assertEqual(e.path, "/query/datetime/date/string?datetime_query=2013-10-20T19:20:30+01:00&date_query=2013-10-20&string_query=string_query_example")
+
+class EchoServerResponseParser():
+    def __init__(self, http_response):
+        if http_response is None:
+            raise ValueError("http response must not be None.")
+
+        lines = http_response.split("\n")
+        self.headers = dict()
+        x = 0
+        while x < len(lines):
+            if x == 0:
+                items = lines[x].split(" ")
+                self.method = items[0];
+                self.path = items[1];
+                self.protocol = items[2];
+            elif lines[x] == "": # blank line
+                self.body = "\n".join(lines[x:])
+            else:
+                key_value = lines[x].split(": ")
+                # store the header key-value pair in headers
+                if len(key_value) == 2:
+                    self.headers[key_value[0]] = key_value[1]
+            x = x+1
+            
+if __name__ == '__main__':
+    unittest.main()